Boiler.



Patented Aug. 7, I900. G. S. STRONG.

BOILER.

(Application filed June 2, 1898.)

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(Application filed June 2, 1898.)

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No. 655,588. Patented Aug. 7, I900.

G. S. STRONG.

BOILER.

(Application filed June 2, 1898.)

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Patented Aug. 7, I900.

BOILER.

(Application filed June 2, 1898.)

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(No Model.)

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No. 655,588. Patented Aug. 7, I900;

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BOILER.

(Application filed June a, was. (No Model.) .6 Sheets-Sheet 5,

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No. 655,588. Pate nted Aug. 7, I900.

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BOILER (Application filed June 2, 1898.)

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UNITED STATES PATENT OFFIcE.

GEORGE S. STRONG, OF NElV' YORK, N. Y.

BOILER- SPECIFICATION forming part of Letters Patent No. 655,588, dated August '7, 1900.

Applicati'on filed $11118 2,1898. serial No. 682,399. (ll'o model.)

To aZZ whom it may concern:

Be it known that I, GEORGE S. STRONG, a citizen of the United States ofAmerica, residing in the city, county, and State of New York, have invented a new and useful Improvement in Boilers, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to the construction of boilers, and has for its object to provide a boiler of great steam-generating power and having at the same time simplicity and strength of construction.

In many of its features of construction my boiler embodies inventions which form the subject-matter of another application for Letters Patent filed concurrently with this application and bearing the Serial No. 682,398, the particular features of construction in which my present invention consists having to do chiefly with the provision of the firechamber in the rear of my peculiarly-constructed boiler, with the division of the firechamber, and with certain other detailsof construction, which will be best understood as described in connection with the drawings, in which they are illustrated.

In said drawings, Figure 1 is a central longitudinal section through a boiler rovided with my improvements, taken as on the section-line 1 1 of Fig. 2. Fig. 2 is a front View of such boiler, the portion to the left being indicated in horizontal section, taken through the fire-chamber, as on the section-line 2 2 of Fig. 1. Fig. 3 is a plan view of a portion of the boiler, the portion to the left being shown as taken on the section-line 33 of Fig. 2. Fig. 4 is a longitudinal section through a modified form of my boiler, taken as on the section-line 4 at of Fig. 5. Fig. 5 is a front view of the said modification. Fig. 6 is a longitudinal section through still another modification of my boiler, taken as on the section-line 5 5 of Fig. 7. Fig. 7 is a front view of the last' mentioned modification, the portion to the left being shown as taken on the section-line 6 6 of Fig. 6. Fig. 8 is a plan View, the portion to the left in section on the line 7 7 of Fig. 7 Ijig. 9 isa longitudinal section showing still another modification of my invention, the section being taken as on the line 8 8 of Fig. 10. Fig. 10 is a front view, the portion to the left in section as on the line 9 9 of Fig.9. Fig. 11 is an enlarged sectional view through the bottom of the two headers, showing certain details of construction. Figs. 12, 13, and 14 are sectional views through the end of a tube B, showing the cap and cap-securing mechanism used in connection with these tubes. Fig. 15 is an end View, and Fig. 16 an edge view, of the cap; and Fig. 17 isan end view, and'Fig. 18 a side view, of the cap-anchoring hook.

A and A are headers between which the fire-box of my boiler is'situated and which may be constructed in any convenient way, the clam-shell joint between the two plates forming the headers being a convenient one where the headers are to be used as a part of a locomotive-boiler, which is the use illustrated inthe drawings. The lateral sides of the head ers are connected by two sets of tubes B B, which form, so to speak, theinner side walls of the fire-chamber and are preferably used to support the outer walls P, formed of tiles and made with air-channels 19, through which the air enters at the top and emerges into the firechamber at bottom, as shown. The tubes B are preferably inclined inwardly over the grate, as shown,and preferably,also,increased in number toward the upper part of each set, as is also shown. It will ,be noted that the tubes B are shown as passing entirely through each header (see particularly Fig. 11) and expanded into both the front and back plates, the portion of the tube lying inside of the header beingslotted, as shown at B to place thetube in free communication with the inside of the header, whilethe ends of the tube are open. most convenient construction where the water-tubes are used, as shown, in connection with comparatively-narrow headers or where they aroused, as shown in Figs. 9 and 10, in connection with a narrow drum, such as R, and when so constructed I close the open ends of the tubes by means of acap, as indicated in Fig. 11 and in greater detail in Figs. 12 to 18, T indicating the cap formed with an annular recess T, adapted to fit over the edge b of the tube and to hold a packing, as indicated at t. The cap is formed with an in tern ally-threaded perforation, as indicated at (See Figs. 12 and 13.) This is the T and has a nut-like extension T on its outer end.

S is an anchoring-hook formed with a hook end S, adapted to hook on to the edge b of a slot B in the tube and with a shoulder S arranged so as to rest against the opposite side of the tube to that engaged by the hooked end and to lie at the rear of the hook when the hooking device as a whole is in its operative position.

S indicates an externally-threaded bolt extending from the rear of the hook S and adapted to screw into the threaded perforation in the cap. Preparatory to use the shank S is engaged, as shown in Fig. 12, with the cap T and then introduced into the end of the tube, as shown in Figs. 12 and 13. Then the cap is screwed up on the threaded shank and the parts brought to the position shown in Fig. 11, affording, as will be readily seen, a certain and secure way of capping the tubes.

Returning now to the general construction of the boiler, I connect the upper portions of the two headers by a conduit or series of conduits, which form or partly form the top of the fire-chamber, the headers in their upper portion being given a form suitable for the particular kind of connections to be made at this point between them. Thus in Fig. 1 the connection between the tops of the headers is by means of two drums O 0, connecting with the headers through outwardly-flanged portions B In Figs. 4 and 5 the connectionbetween the headers is by a single drum 0, as is also the case in the construction shown in Figs. 9 and 10, and in Figs. 6 and 7.1 have shown the upper portion of the headers as connected by a multiple series of tubes (indicated at c) in place of the drums illustrated in the other figures, this last illustration having the 'advantage of providing a very large heatingsurface, though for most purposes the drums C will be found preferable. B B &c., indicate the fire-doors passing through the front header. D indicates the boiler-shell, which is connected with the rear header by means of an outwardly-extending flange B from the rear. plate of said header.

To the extent already described, with the exception of the particular mechanism shown for capping the tubes and with the addition of fire-tubes extending through the shell D, preferably from the front plate of the rear header as a tube-sheet, my boiler is not substantially different from and has in itself points of novelty covered by my copending application for a patent already mentioned. In my present construction, however, I provide a combustion-chamber Q, opening at front into the fire-chamber and connected to the front plate of therear header in some convenient wayas shown, for instance, by a flange-segment g, which is riveted at one end to the front plate of the header and at the other end to the combustion-chamber 2. The rear head of the combustion-chamber (indicated at Q, see Fig. 9) forms the tube-sheet for the fire-tubes E, which pass backward through the rear plate of the shell D. (Not shown.)

Vhile my fire-chamber, situated between the front and rear headers, can be advantageouslyleft entirely open between the two lateral sets of tubes B B, I find it, especially for locomotive purposes, desirable to divide it into two connecting-chambers by means of rows of water-tubes extending through the center of the fire-chamber and so connected with the water-space of the boiler as to form a part of the circulating system. Thus in Figs. 1 to 8, exclusively, I have shown this partition system of tubes at B the tubes being connected into the front and rear headers, a portion A of the front plate of the rear header being left intact, passing across the mouth of the combustion-chamber Q for the purpose of receiving the ends of these tubes. Preferably, however, in place of connecting the partition water-tubes with the headers I provide a small connecting-drum R, extending between the lower portions of the front and rear headers, as shown in Figs. 9 and 10, and between this drum R and a central upper drum 0, I arrange the partition-tubes, as indicated at 19 in the said figures. In this construction obviously the portion A extending across the mouth of the combustion-chamber, may be dispensed with.

Having now described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. A boiler having front and back headers, as A A, between which the fire-chamber is situated in combination with one or more conduits connecting the tops of the headers and partly forming the top of the fire-chamber, groups of tubes, as B B, connecting the lateral sides of the headers and partly forming the sides of the fire-chamber, a series of water-tubes dividing the fire-chamber into two divisions, a boiler-shell, as D, secured to the back plate of the rear header and through said header connecting directly with the water-tubes and conduits connecting the headers, a combustion-chamber, as Q, secured to the front plate of the rear header and extending back into the shell D, a tube-sheet Q at the rear end of said chamber and a system of fire-tubes E extending from said tube-sheet through the rear of the shell D.

2. A boiler having front and back headers, as A A, between which the fire-chamber is situated in combination with drums as O and R connecting the headers at top and bottom groups of tubes, as B B, connecting the lateral sides of the headers and partly forming the sides of the fire-chamber, a series of water-tubes connecting the drums C and R and dividing the fire-chamber into two divisions, a boiler-shell, as D, secured to the back plate of the rear header and through said header connecting directly with the water-tubes and conduits connecting the headers, a combustion-chamber, as Q, secured to the front plate of the rear header and extending back into the shell D, a tube-sheet Q at the rear end of said chamber and a system of fire-tubes extending from said tube-sheet through the rear of the shell D.

3. In combination with-a header, of a boilertube, as B, expanded into both sheets of said head and formed with slots B and open ends b in combination With caps T for closing said the edge of a slot in the tube and a bracingshoulder S arranged in the'rear of said hook and a screw connection between the hook and cap as described.

GEORGE S. STRONG.

Witnesses:

CHARLES F. ZIEGLER, D. STEWART. 

